Low Performance while having stable 120+ fps

If aiming on enemies, entering new zones, if an enemy kills a friendly vehicle, it feels like playing with 15 fps while having stable 120+ fps still. i capped my fps to 120, and duse vsync at 1/2. that is enough

it feels as the client-server communication bugs or lags out, by producing a heavy performance loss for whatever reason. also it becomes suspicious as a feeling as an enemy would enable a cheat for a second, a huge game performance applies, i being killed and the performance returns... 

by standing still for 2 seconds, this performance loss is mostly avoided and i can continue to play until a next time.

also running with troopers feels way too heavy, not as fluid as "before".